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8 when wF ¼ 2:00. Thus, the extended applicability of the modiﬁed FG equation is the following. 333, then the types of isotherm are determined by the following limiting values of BF : Type Type Type Type I when 0 < BF < 1=wF V when 1=wF < BF < 1=ðwF À 1Þ III when 1=ðwF À 1Þ < BF < 4=wF condensation when BF > 4=wF Thus, it is proven why the four types of isotherm shown in Fig. 7 can be described by the modiﬁed FG equation. The analysis made above is limited to mathematical considerations. In Figs.

128) and calculate the values of BF for which Eq. (132) is fulﬁlled; we thus obtain wF ð133Þ BF ¼ YðwF À YÞ Equation (133) determines all values of BF at which two-dimensional condensation takes place. The coverages, Y, present in Eq. (133) are the places of minima and maxima mentioned earlier (see also the S-shape condensation isotherm in Fig. 7). The functions BF ðYÞ are shown in Fig. 8 by solid lines. In Fig. 8, it can be seen also that functions BF ðYÞ have absolute minimum values. After differentiation of Eq.